Posted by Nitin Rai | Biology | 4 Responses

An enzyme catalyzes a reaction by speeding it up. A coupling reaction is when the energy needed for the process is supplied by another process.

Pratisthi Pandey
10 months ago

An enzyme is term used for biological catalysts.It generally works in key-lock mechanism.
A coupling reaction is a term used for the reactions where two hydrocarbon fragments are coupled with the aid of a metal catalyst.

gaurav sahu
8 months ago

An enzyme is a term used for biological catalysts.
it binds with the substrate with one of the 3 methods:
1.substrate strain theory
2.induced fit theory
3.lock and key theory
by binding with the substrate it lowers down the activation energy and makes the process feasible.

Nikhil Raj
7 months ago

Enzymes are biological catalysts. Catalysts lower the activation energy for reactions. The lower the activation energy for a reaction, the faster the rate. Thus enzymes speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind. This is termed "induced fit", meaning that the precise orientation of the enzyme required for catalytic activity can be induced by the binding of the substrate.

Enzymes have active sites. The enzyme active site is the location on the enzyme surface where substrates bind, and where the chemical reaction catalyzed by the enzyme occurs. There is a precise substrate interaction that occurs at the active site stabilized by numerous weak interactions (hydrogen bonds, electrostatic interactions, hydrophobic contacts, and van der Waals forces).

Enzymes form complexes with their substrates. The binding of a substrate to an enzyme active site is termed the "enzyme-substrate complex." A generic equation for complex formation is as follows:

Enzymes do not:
Change the equilibrium constant for a reaction. Keq depends only on the difference in energy level between reactants and products.
Change ΔG for a reaction. As shown in the graphs above, enzymes only lower activation energy, but do not change the difference in energy levels between reactants and products.